Secretaries-General
- 1975–1985 — Robert Lonati (France)
- 1986–1989 — Willibald Pahr (Austria)
- 1990–1996 — Antonio Enriquez Savignac (Mexico)
- 1998–2009 — Francesco Frangialli (France)
- 2010–present — Taleb Rifai (Jordan)
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